By D. J. Morris (Auth.)
Presents a close fully-illustrated remedy of the layout of communique networks for command and keep watch over platforms. when masking the elemental idea, emphasis all through is positioned upon the sensible elements of desktop managed conversation. The conversation community is handled as a procedure, instead of as a collection of things of apparatus, and techniques are precise to judge the worthiness of every block and the issues bobbing up in interfacing them into the method. additionally contains comparability tables for the choice of blocks for particular reasons. technique of shifting info among a few of the processing issues, their power merits and attainable defects are appraised and strategies of fixing such difficulties tested. Covers new advances within the fields of packet-switching verbal exchange community, multiple-access conversation approaches, unfold spectrum conversation, electronic voice exchanges, optical conversation, and satellite tv for pc verbal exchange
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Extra resources for Communication for Command and Control Systems
Sample text
It should be added that one must first define the problem which 2 the C system is intended to solve and then try and analyse the difficulties involved. With the resulting information the operational specification requirements of the system can now be defined. In other words, the proposed system objectives and scope must first be classified and then followed by the system's expected qualitative and quantitative performance evaluation. Although these procedures are interesting and have an influence on the commu2 nication network, it is the latter and not the general subject of C system design that is the direct concern of this book.
The reliability factor can then be calculated from the M T B F figures by defining it as a function of the statistical failure rate F of a set of Ν identical equipment units tested, over a time period t: R(t)=e~Nt/F and then M T B F can be expressed as oo MTBF = J R(t) dt . 0 2 It is needless to state that in C applications, the common M T B F factor is not accepted as a measure for system performance, since its statistical measure makes it unreliable for this type of operation. M T B F is used extensively for component reliability where a large number of items can be measured and tested over long periods, and thus presenting best failure results.
Redundancy is defined as the duplication of the equipment or modules in the system for the purpose of reliability or the continuity of operation. The duplicated units, although an integral part of the system, can be eliminated without any loss of information or without any effect on the system's functional performance. In this case each of the duplicated modules are technically identical and they can all perform the same system tasks. In this respect, one should distinguish between the term redundancy and the popular term 'backup'.